Thank you for your question. I am Shefin and I look forward to helping you with your issue today.

Please try the following and let me know the response.

If you are using a Laptop :

Remove all external devices, CDs, AC Adapter and battery from the computer. Keep the AC Adapter and battery unplugged.Hold the power button down for 20-30 seconds. (Nothing will appear on the display and none of the lights will light up.)Plug in the ac adapter ONLY. (Please note that a power indicator light should be lit on the ac adapter when it is plugged in).Normally power on the notebook.If the unit does not power on, remove the ac adapter and insert the battery into the system.Plug the ac adapter back into the system, the battery charging indicator light will light up.

If you are using a Desktop:

Remove all external devices, CDs, all cables including power, monitor, keyboard and mouse from the CPU. Then press and hold the power button for 30 seconds. After doing the same, reinsert power, monitor and keyboard cables, and turn on the computer.

If the issue persists, or you have any questions, please be back and let me know.

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Since you have tried removing Memory, and HDD, the issue might be with main board and I would suggest you consult with a local technician to get the issue resolved. Please know that not all issues can be fixed online; in those cases of a hardware failure, I’ll troubleshoot and diagnose the problem, and provide a practical recommendation for how to proceed.